When I use vectory.push_back(obj), if the length is out of reserved bound, it will deallocate the whole vector and reallocate a big piece of memory. From my understanding I think c++ only allocates 1 more place for the new obj. This is quite inefficient. Is there a way to set the step length whenever the size is out of bound? e.g. 50 more spaces.
View 6 RepliesWhere can I see my program execution step by step? I want to see the changes every line of code do, line by line.
View 4 Replies View RelatedWe can construct vector in following ways
vector<int>v1; //create an empty vector
vector<int>v2(arr,arr+4); ///to create vector from an array
vector<int<v3(v2); //throuh copy constructor
But I have come across some program in a forum,they have create vector like this
vector<int>v(10,5)
I am clueless ,is this allowed?,what syntax allows this?
if a vector is create like this
vector<int>v(3);
v.push_back(1);
v.push_back(2);
v.push_back(3)
v.resize(2);
Now I am curious to know what are the changes those will happen in vector v because of resizing it?
Ok my assignment has me doing vector math with some canned code provided for me by the instructor This is the header file to the class I'm working with and the .cpp file as far as I've gotten it.
#pragma once
#include "Scalar.h"
class Vector2D {
public:
Vector2D();
Vector2D( const Vector2D& ) ;// copy constructor
Vector2D( Scalar element[2] ) ; // initialize with an array
[Code] ....
I'm having trouble seeing which data members I'm multiplying together and what the initial state, continuing state, and after loop action I'm supposed to be using in the for loop.
The error is unclear but suggests Its received a bad pointer from another heap. It references dbgheap.c line 1322 and assertion failure
I have two string vector functions the first is called from the main function, the second is called from the first.
Their purpose is to receive a string of text and numbers in a semi-specific format, which the main body of the code reads from a text file, and delaminates the data as to return the first variable in the string as the variable name and the second as the variable value. Along the way it filters out a lot of the unwanted whitespace and punctuation.
E.g "{ VariableNameA 123 }" would be returned as "VariableNameA" And "123"
The code works perfectly for most of the lines in the text file but fails on one particular line where the first variable is 25 characters long. Basically it works for anything 22 characters or less. There are never more than 4 elements in the vector and each element is never intended to be longer than 25 characters.
It fails trying to return from the second split function to the first split function.
Is there a limit to the size of each vector element? I'm struggling to find a way round this without having to rewrite the whole thing.
vector<string> split(const string &s, char delim) {
vector<string> elems;
split(s, delim, elems);
return elems;
[Code] ....
I am writing a raytracer, and currently I'm working on creating a bounding volume hierarchy to accelerate the process. To do this, I am first creating a vector that holds each of the objects in the scene, and passing this vector to the constructor for my BVH.
Code:
//in header
BVH_Node* bvh;
//in main raytrace function
[Code] .....
I am testing a scene that has only 2 objects, and so it goes to the size == 2 check. The first time it hits makeLeaf(), I segfault. I've used both gdb and valgrind, and of course it's a memory mapping error. gdb's backtrace tells me that the length of the vector I've passed in is -805305610 and the capacity is -21, and that it is inside my makeLeaf() function that the error occurs.
Here's the function:
Code:
BVH_Node* BVH_Node::makeLeaf(GeomObj* v){
BVH_Node* node;
node->obj = v;
node->isObj = true;
return node;
}
The segfault happens at
Code: node->obj = v;
If I run my raytracer without a BVH, the objList works perfectly.
I need to develop a tool to compare geometric structure of point cloud from scanned objects with their CAD model. The CAD model is stored in step file. So how could I extract geometric information from step file? I am totally new for CAD.
View 6 Replies View RelatedI have a doubt and I have two vectors to a function.
A vector is (int *, const int) and the other is (string *, const int) and want to spend the two vectors and unite in a single function
A vector is passed to a function, but spending two vectors and join I cannot find the turn.
try (int *, const int, string *, const int)
But only understands the former as I do
I am building a project using Ogre3D, and I've downloaded the source code of the SDK.
For whatever reason, the program has got a bug. And I want to know what is going on within the SDK, how do I include the SDK source in Visual Studio 2010?
if there is a way to make Visual Studios step into a function while I am debugging.. I am trying to see the value of a certain int and making sure it is what I need it to be.. but whenever I use step into visual studios just skips right over the function and it does all the calculations..
View 4 Replies View RelatedI have an array of blocked users and I want to be able to increase the element size every time a new user is to be blocked.
The blockedUsers array and blockedCount int are global varaibles
Code:
int blockedCount = 0;
char ** blockedUsers; Code: int blockUser(char *username)
{
int i = 0;
[Code]....
I am trying to re-size a bitmap image for a class.They gave us two options to use to do the program with: an array or move the file position indicator. I want to use the file option. All the bitmap header info is checking out. The file after being re-sized should be 822 bytes but it is 1.6 KiB and the image is distorted.
Code:
#include <stdint.h>
/**
* Common Data Types
*
* The data types in this section are essentially aliases for C/C++
* primitive data types.
[Code]...
I made a resize function for my dynamic array template class that goes as follows. Note that the private member variables are T* arr, unsigned used, and unsigned cap.
template <class T>
void darray<T>::resize(unsigned size) {
if (size > cap) {
T* temp_arr = new T[size];
[Code] ....
Whenever I use this function to increase the size of the array, it will work the first time I need to use it, but after that, Visual Studios will trigger a breakpoint at line 14, and if I continue past the breaks, I eventually get _CrtIsValidHeapPointer(pUserData) assertion failure.
I have a bit map which I wants to re-size according to new point. But on Paint Event Method getting error not Implemented.
CODE Under Paint Event Method
private void pictureBox3_Paint(object sender, PaintEventArgs e) {
Point[] destinationPoints = {new Point(200, 20),new Point(110, 100),new Point(250, 30), new Point(250, 30) };
Image image = new Bitmap("D:\APP\Resources\MyPic.Png");
// Draw the image mapped to the parallelogram.
e.Graphics.DrawImage(image, destinationPoints);
}
When I try to resize my form, every time i try to resize it while running, the window blinks between original size and the new size it was given, when i release the mouse it either stay in its new size or shrinks back to its original size, What makes it return to its original size, maybe its something with the form_Resize function..
private bool inForm_Resize = false;
private Size PrevSize;
private void Form1_Resize(object sender, EventArgs e) {
double dRatio = 1.6;
if (!inForm_Resize) {
inForm_Resize = true;
[Code] ....
Is there any way to allow user to resize a CDialog only in one direction ? I mean, by width, but not by height ? How ? I noticed that overriding WM_SIZE, I can do nothing about this issue ...
View 2 Replies View RelatedI am currently working on problem set 4 for Harvard's online CS50 course. I am working on a program that resizes a bmp image by a factor of N. N in entered along with an in-file and out-file in a command line argument. The program needs to calculate the header file for the out-file and write it to the out-file. It then needs to actually resize the image and, again, write to the out-file.
The first question I have relates to the header file, here is my code for calculating the header file:
bi2.biHeight = bi.biHeight *n;
bi2.biWidth = bi.biWidth *n;
int padding = (4 -(bi.biWidth * sizeof(RGBTRIPLE))%4)%4;
bi2.biSizeImage = (bi2.biWidth * sizeof(RGBTRIPLE) + padding) * abs(bi2.biHeight);
bf2.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + bi2.biSizeImage;
And here is my code for writing the new header file (bi2 and bf2) to the out-file:
fwrite(&bf2, sizeof(BITMAPFILEHEADER), 1, outptr);
fwrite(&bi2, sizeof(BITMAPINFOHEADER), 1, outptr);
At this point I need to actually resize the image. As far as I can tell there are 2 ways to go about this you either have to use an array to store each line you want to print repeatedly (and then you can just write it repeatedly) OR you have to move the pointer back in the input stream and repeat the read/resize/write process each time you need to print the row.
It is this that I am stuck on, first of all, I am not sure what system would be better for resizing the image, although I am leaning towards using an array, and regardless, I don't even know where to begin when in implementing either.
So what I am asking for is, first of all, just a "double check" to make sure my header code makes sense. And second of all, a push in the right direction for actually resizing the image. Here is my complete code:
/****************************************************************************
* resize.c
*
* Resizes a BMP piece by piece, just because.
***************************************************************************/
#include
#include
#include "bmp.h"
int main(int argc, char* argv[]) {
// ensure proper usage
if (argc != 4) {
printf("Usage: copy N infile outfile
[Code]....
how can I create a GUI application that can resize also the control buttons. If the user decide to make the windows bigger or smaller I would like my textbox, buttons, etc.. to follow. Like in Java they use a layout manager, but I can't seem to find the answer for c#. I though to use table layout panel, but it doesn't expand when expanding the windows, unless i miss something
View 3 Replies View Relatedclass Matrix1
{
Protected:
int ** data;
[Code].....
// How can we write resize function for Matrix2 class; where this function need to use Protected data members of matrix1 class? Only setters are available in Matrix 1 class but there is no getter function in Matrix1 class !
How can we write resize function for Matrix2 class; where this function need to use Protected data members of matrix1 class? Only setters are available in Matrix 1 class but there is no getter function in Matrix1 class !
class Matrix1 {
Protected:
int ** data;
[Code]....
i have 1 class with several class's and 1 structure:
Code:
struct Images {
HBITMAP ImageImage;
BITMAP Imagebm;
HDC ImagehdcMem;
HBITMAP ImageMaskImage;
[Code] .....
But I get these error:
"--------------------Configuration: Sprite2 - Win32 Debug--------------------
Compiling...
Test Sprite2.cpp
C:UsersJoaquimDocumentsVisual C 98Sprite2Test Sprite2.cpp(23) : error C2440: 'type cast' : cannot convert from 'void *' to 'struct Images'
No constructor could take the source type, or constructor overload resolution was ambiguous
Error executing cl.exe.
Sprite2.exe - 1 error(s), 0 warning(s)"
I try search more code, but i get more errors ...
Suppose I wished to reallocate memory (resize) an array of pointers. Why does the following not work?(The program runs, yet yields a faulty segmentation error message. Why?):
Code: char **ptrarr = (char**) malloc(sizeof(char*))
Code: ptrarr = (char**) realloc(ptrarr, (capacity) * sizeof(char*));
any easy way to resize property sheet/page dialogs automatically or semi automatically?. have tried too many stuff, but none were fruitful.
View 5 Replies View RelatedException Details: System.ArgumentOutOfRangeException: Length cannot be less than zero. Parameter name: length
using System;
using System.Data;
using System.Configuration;
[Code]....
How to output vector contents using the push_back function. My program reads in values just fine, but it does not output anything and I've been stuck on why.
here is my code:
#include <iostream>
#include <array>
#include <vector>
using namespace std;
int duplicate( vector < int > &vector1, const int value, const int counter)
[Code].....
I have a cpp app that reads in a number of files and writes revised output. The app doesn't seem to be able to open a file with a ' in the file name, such as,
N,N'-dimethylethylenediamine.mol
This is the function that opens the file :
Code:
// opens mol file, reads in rows to string vector and returns vector
vector<string> get_mol_file(string& filePath) {
vector<string> mol_file;
string new_mol_line;
// create an input stream and open the mol file
ifstream read_mol_input;
read_mol_input.open( filePath.c_str() );
[Code] ....
The path to the file is passed as a cpp string and the c version is used to open the file. Do I need to handle this as a special case? It is possible that there could be " as well, parenthesis, etc.